[NET]: cleanup 3rd argument in netlink_sendskb

netlink_sendskb does not use third argument. Clean it and save a couple of
bytes.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index e638256..7b552b6 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -194,7 +194,7 @@
 int netlink_attachskb(struct sock *sk, struct sk_buff *skb, int nonblock,
 		long timeo, struct sock *ssk);
 void netlink_detachskb(struct sock *sk, struct sk_buff *skb);
-int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
+int netlink_sendskb(struct sock *sk, struct sk_buff *skb);
 
 /*
  *	skb should fit one page. This choice is good for headerless malloc.